Groundwater Potential Mapping in Relation to Performance of Boreholes in
Weathered/Fractured Basement at Afe Babalola University Ado Ekiti Nigeria
1Oyegoke, S.O., 2Adebanjo, A.S., 3Ayeni, O.O. and 4Olowe, K.O.
1, 2, 4Department of Civil Engineering, Afe Babalola University Ado Ekiti (ABUAD), Ekiti, Nigeria.
3Department of Civil Engineering. The Federal Polytechnic, Ado Ekiti, Ekiti, Nigeria
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This research was carried out with the aim to check the validity and efficiency of the existing groundwater potential map of Afe Babalola University, Ado Ekiti (ABUAD). The performance rating of the drilled boreholes that spread across the institution was used to validate the groundwater potential map produced by Ademilua and Eluwole in 2013. Forty (40) boreholes that were drilled in the institution were evaluated and overlaid on the existing groundwater potential map with their coordinates serially numbered. From the results obtained, it was observed that in locations designated as having good to moderate groundwater yield (potential) on the map, 21 of drilled boreholes were active, 11 were failed/dry boreholes, meanwhile, for the locations designated as having poor groundwater yield, four of drilled boreholes were active while another four were
failed/dry boreholes. This result gives a 62.5% performance rating that the existing groundwater potential map can serve as a useful guide for the purpose of site selection for groundwater exploitation but for optimal usage, an improved map is required.
Keywords: Yield, efficiency, aquifer, overburden thickness, tectonic, Universal Positioning System